Argthtjtr

Good day everyone! I have a problem the app crash and it has an error

java.lang.NullPointerException: Can't pass null for argument 'pathString' in child()

        at com.google.firebase.database.DatabaseReference.child(Unknown Source:6)

        at com.example.jasper.happy_paws.CommentAdapter.getUserInfo(CommentAdapter.java:95)

        at com.example.jasper.happy_paws.CommentAdapter.onBindViewHolder(CommentAdapter.java:51)

        at com.example.jasper.happy_paws.CommentAdapter.onBindViewHolder(CommentAdapter.java:26)

        at android.support.v7.widget.RecyclerView$Adapter

I dont see anyproblem with my adapter here is my code

public class CommentAdapter extends RecyclerView.Adapter<CommentAdapter.ViewHolder> {



    private Context mContext;

    private List<CommentModel>mComment;

    private FirebaseUser firebaseUser;



    public CommentAdapter(Context mContext, List<CommentModel> mComment) {

        this.mContext = mContext;

        this.mComment = mComment;

    }



    @NonNull

    @Override

    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        View view = LayoutInflater.from(mContext).inflate(R.layout.comment_items, parent, false);

        return new CommentAdapter.ViewHolder(view);



    }



    @Override

    public void onBindViewHolder(@NonNull ViewHolder holder, int i) {

        firebaseUser = FirebaseAuth.getInstance().getCurrentUser();

        final CommentModel commentModel = mComment.get(i);



        holder.comment.setText(commentModel.getComment());

        getUserInfo(holder.image_profile,holder.username, commentModel.getUserid());



        holder.comment.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                Intent intent = new Intent(mContext, Account.class);

                intent.putExtra("userid", commentModel.getUserid());

                mContext.startActivity(intent);

            }

        });



        holder.image_profile.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                Intent intent = new Intent(mContext, Account.class);

                intent.putExtra("userid", commentModel.getUserid());

                mContext.startActivity(intent);

            }

        });







    }



    @Override

    public int getItemCount() {

        return mComment.size();

    }



    public class ViewHolder extends RecyclerView.ViewHolder{



        public ImageView image_profile;

        public TextView username,comment;



        public ViewHolder(View itemView) {

            super(itemView);



            image_profile = itemView.findViewById(R.id.image_profile);

            username = itemView.findViewById(R.id.username);

            comment = itemView.findViewById(R.id.comment);

        }

    }

    private void getUserInfo(final ImageView imageView, final TextView username, String userid)

    {

        DatabaseReference reference = FirebaseDatabase.getInstance().getReference().child("User").child(userid);

        reference.addValueEventListener(new ValueEventListener() {

            @Override

            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

                UsersHappyPaws usersHappyPaws = dataSnapshot.getValue(UsersHappyPaws.class);

                Glide.with(mContext).load(usersHappyPaws.getProfilepic()).into(imageView);

               username.setText(usersHappyPaws.getName());

            }







            @Override

            public void onCancelled(@NonNull DatabaseError databaseError) {



            }

        });

    }

}

Try this way..
If getting data code is working then pl change this things.

get data from firebase take into activity or fragment.

    private List<UsersHappyPaws> pawsList=new ArrayList<>();

private void getUserInfo(final ImageView imageView, final TextView username, String userid)

{

    DatabaseReference reference = FirebaseDatabase.getInstance().getReference().child("User").child(userid);

    reference.addValueEventListener(new ValueEventListener() {

        @Override

        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

            UsersHappyPaws usersHappyPaws = dataSnapshot.getValue(UsersHappyPaws.class);

            pawsList.add(usersHappyPaws);

        }







        @Override

        public void onCancelled(@NonNull DatabaseError databaseError) {



        }

    });

}

make adapter class make constructor add pass data into mange.take one array list into adapter class.

public CommentAdapter(Context mContext, List<CommentModel> mComment,List<UsersHappyPaws> pawsList) {

    this.mContext = mContext;

    this.mComment = mComment;

    this.pawsList=pawsList;

}

after that make object for UsersHappyPaws class and bind data according.